Density is probably the easiest.
You could check the hardness. Alkali and alkali earth metals tend to be really soft (and highly reactive, so it’s not likely you’d have a pure sample sitting in front of you.)
Then melting point. Most metals have a pretty high melting point, but a few are lower. (Mercury and Mercury’s safe cousin gallium.)
Color could be helpful if it’s not silver. (Few metals aren’t shiny and silver).
And then… if you had a galvanic cell you could do some plating and figure it out via the activity series.
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